The BJP-Akali Dal alliance candidate, Manjinder Singh Sirsa, had defeated the Congress's Meenakshi Chandela by 14,652 votes, while the AAP candidate lost his security in the triangular contest.
He defeated his nearest rival Meenakshi Chandela of the Congress by a margin of almost 14,000 votes, pushing the ruling AAP's candidate to a distant third.
Dubbing its victory a reflection of the "Modi wave", the party's Delhi chief Manoj Tiwari exuded hope of sweeping the municipal polls which will be held on April 23.
New Delhi, Apr 13 In a rude shock to the ruling AAP ahead of the crucial MCD polls, the party today suffered a humiliating drubbing in the Rajouri Garden by-poll, which saw its candidate relegated to the third position. The seat held by AAP fell vacant after its sitting MLA Jarnail Singh resigned a year ago to contest elections against former chief minister Parkash Singh Badal in Punjab.
Almost 1,300 votes were divided among the other contestants and all of them lost their security deposits. He had won the seat in 2013. "In the last few years, the proponents of such politics turned Delhi into anarchy and the people of Delhi have completely rejected them", BJP leader Vinay Sahasrabuddhe said.
In Madhya Pradesh, BJP retained the Bandhavgarh Assembly seat after defeating rival Congress by a margin of over 25,000 votes. AAP had won 67 seats in Assembly elections held in 2015. Similarly, both seats in Karnataka went to the party in power, the Congress, while people voted the ruling Trinamool Congress to victory in the lone Bengal seat. "This is the end of Aam Aadmi Party (AAP)-led government in Delhi", Sirsa said.
Congress came in second, with nominee Banwari Lal Sharma finishing with 52,875 votes.
The BJP snatched Rajouri Garden from the AAP and Dholpur in Rajasthan from the Bahujan Samaj Party (BSP).
As per the final score, Bharatiya Janata Party (BJP) got 40,602 votes. Conceding defeat, Sisodia said "We will also consult the people, will try to work on shortcoming".
The result has left a dent in the aspirations of AAP weeks before the scheduled MCD polls in the national capital region.
In a statement here, Mr Badal said the result was a referendum on the policies of AAP in Delhi and had set the tone for the complete defeat of AAP in the forthcoming elections to the Delhi municipal corporation.